We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
THE PARTS OF A LANTERN 15 be so. But besides the want of appearance, there is the ob- jection to a simple metal body that it becomes very hot, and may manifest this fact very suddenly and unpleasantly when any manipulation is necessary. For this reason all the better lantern bodies are made of wood, lined with an iron or tin casing supported at a small distance from the wood, so as to keep the outer body cool. The shape of a single lantern body may vary a great deal, and has some connection with the radiant employed. With Argand lamps (either gas or oil), which require a tall glass chimney, a body is still employed (almost of necessity) rather tall in proportion; and the earlier lime-light lanterns were similarly made, from custom. But the introduction of tho Sciopticon form of lamp caused a revolution in the form of body also. There being no wick chimney, the tall chimney of the flame chamber was attached to the lamp itself, and the body of the lantern was lowered. All lanterns of the edge- wick class are now made with low bodies ; and the same are found ample for the lime-light. The wood of the body should be perfectly plain and sound in grain, old and well-seasoned. Any ' ornamentation * is out of place, as will be remarked upon again. Where exhibitions may have to be made in various places, it is of some importance to have a door on both sides of the lantern. Most people work from the right side (as the lantern faces the screen), but this is not always possible, especially with experiments. In all lanterns used with the lime-light, each door should be furnished with a sight-hole glazed with dark blue glass, through which the state of the lime can be examined without dazzling the eye. For a lantern used only with paraffin oil, sight-holes are useless, the flame being examined through a sight-hole at the back of the lamp. The back of the body also demands a word. For Argands, it is closed in entirely. For paraffin lamps it needs little con- sideration, the lamp itself being closed in, with the exception